Six ports, including two Thunderbolt ports and a MagSafe charging port
on the left side of the machine, and an HDMI port, a Thunderbolt port, and SD-card reader
on the right side of the machine. This means that there are three Thunderbolt ports expected, one less than on current high-end MacBook Pros.
Boo. Trading SD for TB is a regression.
It's not a trade. An SD card just needs a single USB 3.1 lane (or one PCIe lane if it's a fancy one). A Thunderbolt 4 port needs a whole extra Thunderbolt controller on the SoC which consumes 4 PCIe lanes
and a pair of DisplayPort streams (or the extra circuitry to switch existing ones)
and power delivery circuitry and - ideally - extra charging circuitry - most of which is rendered inaccessible if you plug a bog standard SD reader into the socket...
That's the problem with the "one true port" - a mobile SoC has limited I/O resources, the resources needed for a single TB4 port can power half-a-dozen so-called "legacy" ports
that you can use simultaneously. Combining so many unrelated functions into a single port is a pointless bottleneck on a full-size laptop that has plenty of space for physical ports - its an idea borne of the "why would anybody buy a laptop when you can have a tablet" mindset that prevailed a few years back.
Anyway, if the new MBP has 3 TB ports each driven by their own controller, then that's
50% more TB bandwidth than the old 16" MBP, which had 4 ports sharing only 2 controllers/ Even the 2-port M1 Macs have the same theoretical TB bandwidth as the 4-port Intel models - and the new ports are compatible with the new TB4 hubs with multiple downstream TB connections.
However, in the spirit of pessimism, all those leaked schematics show is 3 USB type-C ports, with no indication of what protocols they support. I think there's an outside chance that the third port will be USB-3.1 only - just like the 3rd and 4th ports on the higher-end 24" iMac.
Three TB ports just seems like an odd number (well, d'uh!)
At the very least, need a USB-C to MagSafe cable so we can reuse the ones we have.
I'd be surprised if one or more of the USB-C ports didn't support charging - otherwise you wouldn't be able to power the Mac from a USB-C/TB dock or display... so you could use any USB-C charger & cable that way.
I think the rumours were talking about higher power delivery (for fast charging) than supported by USB-C as one reason for restoring MagSafe - so a USB-C to MagSafe cable might not be a thing. I wonder if we'll see Ethernet in the power brick (like the iMac) - although that doesn't make so much sense with a breakaway connector like MagSafe (the iMac magnetic connector isn't designed to break away easily).